Area Forecast Discussion
Issued by NWS Seattle/Tacoma, WA

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FXUS66 KSEW 032158

Area Forecast Discussion
National Weather Service Seattle WA
200 PM PST Thu Dec 3 2020

.SYNOPSIS...A weak front will break up over Western Washington
tonight. High pressure will rebuild Friday and then weaken. A weak
weather system will reach the area Saturday night. A wetter
frontal system is likely to reach the area Tuesday.


.SHORT TERM /TONIGHT THROUGH SUNDAY/...A weak weather system
might bring a few sprinkles to the area this evening, there isn`t
much on radar this afternoon. The upper ridge will rebuild Friday.
The ridge will shift east and weaken as a stronger front nears the
area Saturday afternoon. Western Washington should get a little
rain out of that system with scattered showers ending on Sunday. 19

.LONG TERM /MONDAY THROUGH THURSDAY/...A frontal system is likely
to move through Western Washington around Tuesday--that system looks
run of the mill. Overall, guidance suggests the weather pattern will
be back to some rain at times--but not necessarily very wet or
stormy. The details of the systems out around the middle of next
week are all over the map with big differences between the 12z GFS
and ECMWF. The 6-10 day outlook suggests normal temps with below
normal precip is a good bet out around the end of next week. 19


.AVIATION...A weak front will dissipate near the coast this
evening with westerly flow aloft tonight and Friday. The air mass
will be stable with mid and high level moisture tonight. Areas of
low clouds will likely develop near the coast later tonight. There
might also be a few patches of IFR low clouds and fog in the usual
interior valley locations. The air mass will dry out on Friday
with mostly clear skies by afternoon.

KSEA...Mid and high clouds tonight. There could be a few hours of
ceilings near 5000 feet early Friday morning. Mostly clear skies
by late Friday morning. Generally light winds. Schneider


.MARINE...A weak front will dissipate over the Coastal Waters
this evening. A second frontal system will move through the area
Saturday afternoon and evening. A third frontal system will reach
the area Monday into Monday night. The Monday system could bring
gale force southerly winds to the Coastal Waters. Schneider


.HYDROLOGY...Flooding is not expected over the next seven days.


PZ...Small Craft Advisory until 6 AM PST Saturday for Coastal Waters
     From Cape Flattery To James Island 10 To 60 Nm-Coastal
     Waters From Cape Flattery To James Island Out 10 Nm-Coastal
     Waters From James Island To Point Grenville 10 To 60 Nm-
     Coastal Waters From James Island To Point Grenville Out 10
     Nm-Coastal Waters From Point Grenville To Cape Shoalwater
     10 To 60 Nm-Coastal Waters From Point Grenville To Cape
     Shoalwater Out 10 Nm.

     Small Craft Advisory until midnight PST Friday night for Grays
     Harbor Bar.

     Small Craft Advisory from 4 AM to 4 PM PST Friday for West
     Entrance U.S. Waters Strait Of Juan De Fuca.


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